//  branch hints
//  Copyright (C) 2007, 2008 Tim Blechmann
//
//  Distributed under the Boost Software License, Version 1.0. (See
//  accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)

//  Disclaimer: Not a Boost library.

#ifndef BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED
#define BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED

namespace boost
{
namespace lockfree
{
    /** \brief hint for the branch prediction */
    inline bool likely(bool expr)
    {
#ifdef __GNUC__
        return __builtin_expect(expr, true);
#else
        return expr;
#endif
    }

    /** \brief hint for the branch prediction */
    inline bool unlikely(bool expr)
    {
#ifdef __GNUC__
        return __builtin_expect(expr, false);
#else
        return expr;
#endif
    }

} /* namespace lockfree */
} /* namespace boost */

#endif /* BOOST_LOCKFREE_BRANCH_HINTS_HPP_INCLUDED */
